The present invention is to provide a head strap device which includes a head strap having a first set of connecting section, a second set of connecting section, and a central section, and an adjustment buckle for positioning and adjusting the head strap, characterized in that: the central section of the head strap is a curved surface that can be naturally approach engagement on a back of the head while worn to avoid the head strap sliding, in addition, an opening disposed within a body of the adjustment buckle, and a pins and a guide posts disposed with misaligned each other on the opening that can separate the overlapping head strap after assembled, so that there is no need to remove the swimming goggles when the head strap is worn and adjusted, to achieve the effect of easily use.

Swimming goggles have a left-eye covering and a right-eye covering, each having a corresponding transparent window that defines a field of view and each further having a seal extending between the transparent window and the swimmer's face and formed to exclude water. A near-eye display is in signal communication with an image processor and forms a virtual image in the left- or right-eye field of view.

The invention relates to spectacles, systems and methods for visibility enhancement, including by glare suppression. The spectacles, systems and methods for visibility enhancement includes spectacles and a spectacle lens having a liquid crystal cell (LC), the transmission (TR) of which may be varied by a suitable control and the liquid crystal cell (LC) designed so that the transmission (TR) of the liquid crystal cell (LC) may be switched between high and low transmission states. The liquid crystal cell (LC) includes a control for regulating the times of the state of high transmission (T.sub.on) of the liquid crystal cell (LC) such that the temporal position of the times of the high transmission state (T.sub.on) within a period of times of the high transmission state (T.sub.on) and times of the low transmission state (T.sub.off) may be altered continuously or discontinuously; and/or the duration of a period of times of the high transmission state (T.sub.on) and times of the low transmission state (T.sub.off) may be altered continuously or discontinuously. Such changes may be determined by a secret coding key.

A structure of an underwater sports mask includes a lens frame, a lens portion and a water sealing skirt. A central area of the lens frame is provided with a positioning device for connecting a frontal breathing tube, and the positioning device allows the breathing tube to move along the axial direction of the breathing tube.

Swimming goggles have a left-eye covering and a right-eye covering, each having a corresponding transparent window that defines a field of view and each further having a seal extending between the transparent window and the swimmer's face and formed to exclude water. A near-eye display is in signal communication with an image processor and forms a virtual image in the left- or right-eye field of view.

Swimming goggles of the present invention include a pair of lenses. Each lens has a window. The window is connected with a ventilated waterproof device that is watertight but not airtight, through which a heat on an inner side of the lens produced by human body in form of fog and water particles permeates toward an outer side of the lens; relatively, fog on the outer side of the lens is soon turned into water drops through condensation, the water drops are too large to undergo reverse permeation into the inner side of the lens; because of the effect of surface tension within the condensed water drops, water molecules pull each other as a stable state and are unable to be separated from the water drops toward the inner side of the lens so that the water leakage of the swimming goggles is eliminated and waterproof function is achieved.

A system includes a minimally intrusive display system (MIDS) configured to be disposed on an eyewear. The MIDS includes a display system and a sensor system configured to provide for a sensor data. The MIDS further includes a processor configured to process the sensor data to derive an activity metric. The processor is further configured to display, via the display system, the activity metric, wherein the display system is disposed in the eyewear so that the activity metric is only viewed when a user of the eyewear turns the user's pupil towards the display system at angle α from a forward direction.

The present invention concerns a swimming goggle including at least one main body including: (a) an outer lens; (b) an inner lens; (c) a sealed gap separating the outer lens and the inner lens; and (d) an inner space arranged adjacent to the inner lens.

The invention relates to a pair of goggles which comprise a frame with two rims in which an optical unit is respectively intended for being assembled via a reversible attachment device in order to provide an inner attachment of said optical unit in said rim, each device comprising a button and a cavity rigidly connected to an outer edge of the optical unit and the rim, respectively, said button being capable of being inserted into said cavity in order to provide external locking of the optical unit in the rim, each rim having one recess opening onto the rear, each optical unit having a front bearing surface which, in the assembled state, is arranged against a rear complementary bearing surface of said recess, at least one of the outer edges being reversibly deformable to allow the placement and the withdrawal of said button in said cavity when the bearing surfaces are arranged against one another.

A pair of swimming goggles includes a frame having a first sub-frame and a second sub-frame. The first and the second sub-frames have a first opening and a second opening defined therein. A first lens is secured in the first sub-frame and a second lens is secured in the second sub-frame. A first eye-piece and a second eye-piece are arranged adjacent to the first sub-frame and the second sub-frame, respectively. A third lens is secured in the first eye-piece and a fourth lens is secured in the second eye-piece. A first connecting member and a second connecting member releasably secure the first eye-piece and the second eye-piece to the first and the second sub-frames, respectively. At least one of the third and the fourth lens may take the form of a corrective lens.